Eclipse/GWT: Resolve the error ‘unable to find a module’

Problem:
When during the launch of an application on local Jetty server via Eclipse, there is the following error :

Loading modules
de.toolforge.googlechartwrapper.googlechartwrapper
[ERROR] Unable to find 'de/toolforge/googlechartwrapper/googlechartwrapper.gwt.xml' on your classpath; could be a typo, or maybe you forgot to include a classpath entry for source?
[ERROR] shell failed in doStartup method

Solution
In Eclipse

Run -> Run Configurations,

Select your application to deploy,

Go in Arguments tab,

Then you have to delete the bad module which, in our case, is ‘de.toolforge.googlechartwrapper.googlechartwrapper’